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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (MAPREDUCE-2026) JobTracker.getJobCounters() should not hold JobTracker lock while calling JobInProgress.getCounters()
Date Thu, 07 Oct 2010 21:28:32 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen reassigned MAPREDUCE-2026:
-------------------------------------

    Assignee: Joydeep Sen Sarma  (was: Scott Chen)

Actually, Joydeep has a better fix for this. Let me assign this to him.

> JobTracker.getJobCounters() should not hold JobTracker lock while calling JobInProgress.getCounters()
> -----------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2026
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2026
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Scott Chen
>            Assignee: Joydeep Sen Sarma
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-2026.txt
>
>
> JobTracker.getJobCounter() will lock JobTracker and call JobInProgress.getCounters().
> JobInProgress.getCounters() can be very expensive because it aggregates all the task
counters.
> We found that from the JobTracker jstacks that this method is one of the bottleneck of
the JobTracker performance.
> JobInProgress.getCounters() should be able to be called out side the JobTracker lock
because it already has JobInProgress lock.
> For example, it is used by jobdetails.jsp without a JobTracker lock.

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